This example is specific to science only to explain the protocol. Vocabulary from any content area could be used with this protocol.
The word "Mitochondria" is written on one side of an index card, and the definition "the building block of life" is written on the other. A different index card has the word "cell" on one side, and the definition "a substance that acts as a catalyst for chemical reactions in the body". This pattern for word/definition is repeated on as many cards as needed to ensure each student has at least one card.
The protocol begins with a random student reading the definition on their card, another student will have the word on their card and say it out loud and then read the definition on their card. This bounces the vocabulary around the room until the final definition has been read and the last word should be on the card of the student who started the process. Ex) Student A reads "the building block of life", student B says "cell" and reads "a substance that acts as a catalyst for chemical reactions in the body", student C would say "Enzyme", and the protocol would continue until all words/definitions have been read.
The teacher could time the protocol and make it into a competition to see which class could get through the vocabulary the fastest.